期刊
POLYMER DEGRADATION AND STABILITY
卷 203, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2022.110083
关键词
Cross-linked polytetrafluoroethylene; Ultra-small angle X-ray scattering; Microstructure evolution; Degradation
资金
- National Key R&D Program of China [2020YFA0405802]
- National Key Laboratory of Materials Behavior and Evaluation Technology in Space Environment Harbin Institute of Technology [6142910190203]
This study used synchrotron ultra-small angle X-ray scattering techniques combined with in-situ uniaxial stretching to investigate the degradation mechanism of cross-linked polytetrafluoroethylene (XPTFE) in real time. The results showed that the scatterers for XPTFE became more unequal with increasing cross-linking degree. After stretching or irradiation, the mechanical properties of XPTFE were lost, resulting in the dominance of broken crystals and the formation of voids during stretching. However, XPTFE under constant stress uniaxial stretching exhibited a degree of thermal stability.
Cross-linked polytetrafluoroethylene (XPTFE) with excellent wear and radiation resistant is expected to be applied in strong radiation fields. In this study, synchrotron ultra-small angle X-ray scattering (USAXS) techniques combined with in-situ uniaxial stretching were firstly used to study the mechanical property degradation mechanism of XPTFE in terms of micro-structural evolution in real time. As the increase of cross-linking degree, the size and spacing of the scatterers for XPTFE were more unequal. When XPTFE was uniaxially stretched at room temperature, its molecular chains were tilted, and lamellae crystals were elongated and thinned along the stretching direction. When XPTFE was irradiated by.-rays under air, with increasing absorbed doses, the long period decreased first and then increased, while the gyration radius was reversed. After high-dose irradiation, the mechanical properties of XPTFE were lost, making their stretching processes were dominated by the orientation of some small broken crystals along the stretching direction and accompanied by the formation of voids. But for XPTFE under constant stress uniaxial stretching at variable temperature, its chain segments and molecular chains cannot be oriented even at elevated temperatures, maintaining a degree of thermal stability.
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